<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<div id="app">
			<div id="a" class="b">
				<input type="text" name="" id="" value="" />
				<input type="text" name="" id="" value="" />
				<input type="text" name="" id="" value="" />
				<div id="d1_1">
					
				</div>
			</div>
			<div id="d2">
				
			</div>
		</div>
		
		<script type="text/javascript">
			
			var a=document.querySelector("#a");
			var b=document.querySelector(".b");
			var c=document.querySelectorAll("a>input[type=text]")
			var d=document.querySelectorAll("#app div");
			var e=document.querySelectorAll("#app>div");
		</script>
	</body>
</html>
